A phone call to his sister leads Flex Sheridan into a nightmare and a quest to save his family from a new, horrifying epidemic that's turning humans into zombies. As he makes his way from Georgia to Gainesville, Florida and back, he picks up old and new friends and survivors. Flex reconnects with perhaps the strongest woman he's ever known, Gem Cardoza, his former girlfriend.

Those who would seek a new world order have unleashed the most devastating virus onto mankind, and even they do not know the secrets hidden in their weapon. Follow along as Harry, a CDC scientist, races to figure out what exactly the virus is and how to stop it. It will be up to him and a group of marines led by Major Sanders to stop the zombie fallout before it ravages an unsuspecting world.

Two teenagers find a frozen corpse in the middle of the woods and decide to bring it back to town. They have no idea they just sparked the zombie apocalypse. In the morgue below the hospital, the dead begin waking up and attacking the living. The infection spreads rapidly, turning the place into a slaughterhouse as those inside fight to survive against the undead.

SWAT is prepared for every scenario, except for when the dead walk. In the early morning hours of Day Zero, Brandon Shelton and the rest of his SWAT team respond to a routine call on the University of Texas campus. As the situation goes from bad to worse, they struggle to survive the day against the growing horde of zombies. 

At the end of the world. Nick Peterson never expected to be stuck with a bunch of kids. A 17-year-old boy shouldn’t be responsible for keeping other people alive. But he didn’t have much choice in the matter. That’s what happens when everyone else dies.